Repeat action mechanism for power-operated typewriters

ABSTRACT

A repeat action mechanism for operating a type bar having a part operatively connected to said type bar, a control lever pivotally mounted on a key lever depressible to first and second positions, the control lever including a first portion for initiating a transitory connection with said part and a power roll upon depression of the key lever thereby to begin operating said type bar, and a second portion for repeatedly causing said transitory connection upon depression of the key lever to the second position. The second position is adjustable independently of the first position.

ileiiee iaies emit Hishida et 21%., 1 Feb. 1, 1972 [543 REPEAT AKZTIONMECHANISM FOR 2,818,151 12/1957 Yaeger ..197 17 PGWER-QPERATEDTYPEWRKTERS 2,870,896 1/1959 Riffel 197/17 s RE25,011 7/1961 Barkdoll..l97/l7 [721 High-ma; T 5,2i2j15i6 10/1965 Frechette et al. ...197/17 xNagaya' Japan 3,342,295 9/1967 Hishida ..197/17 [73] Assignee: Erotherindustries Ltd Nagaya, Japan Primary Examiner-Emest T. Wright, Jr. {22]Filed 1969 Attorney-Sughrue, Rothwell, Mion, Zinn 8: Macpeak [21] Appl.No.: 789,776

[57] ABSTRACT [52] 3.1.8. Cl. ..l97/17 A repeat action mechanism foroperating a type bar having a 3111!. CL 1 23/08 part operativelyconnected to said type bar, a control lever F3251? 0 183 pivotallymounted on a key leve depressible to first and second positions, thecontrol lever including a first portion for {56] Rage Cited initiating atransitory connection with said part and a power UNHED STATES PATENTSroll upon depression of the key lever thereby to begin operatmg saidtype bar, and a second portion for repeatedly causmg 2,043,393 6/ 1936Pasinslci 197/ 17 aid tran itory connection upon depression of the keylever to 6 1941 Yeager @197/17 the second position. The second positionis adjustable inde- Hart pendenfly ofthe first position 2,734,613 2/1956Kennedy et ..197/l7 2,798,584 7/1957 Kennedy ..197/l83 X 5 Claims, 5Drawing Figures meminrm 11972 36380775 s it 2 m 5 PATENTED FEB 1 1972SHEEI 3 OF 5 PATENTEU FEB 1 I972 SHEET 5 BF 5 REPEAT NCTHBN MECHANHSMFGR PGWER- GEEK-RATES TYFEWEQHERS BACKGROUND OF THE INVENTKON 1. Fieldof the invention The present invention relates to a power-operatedtypewriter, and in particular to a repeat action mechanism for operatinga type bar or other instrumentality in a power operated typewriter.

2. Description of the Prior Art in the well-known power-operatedtypewriter, the action mechanism for operating the type bar or otherinstrumentality for performing other functions such as carriage return,back spacing, etc.. is supplied power from the power roll and includes areciprocating member and a pawl pivotally mounted on the member so as toengage or be disengaged from the roll, and is constructed so as tooperate the type bar or other instrumentality by the engagement of thepawl with the roll which is achieved by depressing the key lever.

in such type of mechanism, generally the mechanism includes a repeataction mechanism wherein the operation is repeated when the key lever isdepressed further than the normal depressed position. This generalrepeat action mechanism consists of a control lever capable of rockingrelative to the key lever and an extension or cam surface formed on thekey lever. The control lever is engaged with the pawl or a triggernormally latching the pawl at the disengaging position out of the roll,and serves to bring about the engagement of the pawl with the roli. Thecontrol lever is rotated relative to the key lever so that the controllever is brought out of the path by impact by the pawl or trigger whichis in the movement back along the definite path with the reciprocatingmember after one operation, when the key lever is held at the normaldepressed position. Therefore, the control lever does not prevent thepawl or the trigger from being moved back to the normal position. n theother hand, the extension or the cam surface of the key lever impactsthe returned pawl or the trigger so as to bring about the engagement ofthe pawl with the roll, when the key lever is further depressed to thefully depressed position for repeat operation and is held at theposition, whereby the pawl or the trigger is prevented from beingreturned to its normal position and the engagement of the pawl with theroll is repeated. in such mechanism, however, the repeat actionmechanism has a disadvantme that uncomfona'ole, rough shock istransmitted to the finger of the typewriting operator when the operatordepresses the key lever during repeat operation, since the shock whichoccurs when the extension or the cam surface impacts the pawl or the tgger is transmitted directly to the key lever. Therefore, typewriterswith the above-mentioned kind of repeat action .echariism require someparticular device to absorb the nentioned shock. Thus, the typewriter ofthis kind is 3: complicated in construction.

Moreover, it is necessary to precisely fix the depressed position of thekey lever for repeat operation in this kind of writer. That is becauseeven a slight displacement of the depressed position affects thecondition of the repeat operation and may even bring about disorder ofimpression or scontinuity of repeat operation in the worst case. Sincethe d position, therefore, is required to be precisely and easilycontrolled there has been no controlling device so far which issatisfactory in construction and price.

SUMMARY OF THE lNl/ENTIQN he present invention provides a repeat actionmechanism makes it possible to operate repeatedly the type bar orinstrumentalities at high speed with certainty and noise.

present invention further provides a repeat action 1 lch is of simpleconstruction and wherein shock nnsznitted directly to the key lever onrepeat operation it does not require any particular shock absorbingdevice. Therefore, the shock made on repeat operation is -tly reduced.

The present invention provides a repeat action mechanism wherein thedepressed position of the key lever for repeat operation can be easilycontrolled regardless of the normal depressed position by a controllingdevice adapted thereto which is both simple in construction andeconomical.

BRIEF DESCRIPTION OF THE DRAWING FIG. l is an elevated cross-sectionalview of the power operated typewriter embodying the type bar action ofthe present invention.

FIGS. 2 through 5 are enlarged cross-sectional views of the poweroperated typewriter shown in FIG. 1 illustrating the operation of thetype bar action.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawing, apreferred embodiment is shown for the type bar mechanism. It is apparentthat the invention is not restricted to this embodiment and can beadapted to other instrumentalities performing other functions such ascarriage return, back spacing, etc. FIG. 1 shows the central andoutermost type action mechanism wherein all parts are at their restcondition. Each type action mechanism is substantially of the same shapeand construction as the other type action mechanisms. The type actionmechanisms are laterally arranged in the machine. In the drawing, onlytwo rows of them are illustrated. The side frame and machine cover arenot shown, but the lateral frames 10, 11, 12 which are supported by theside frames at the opposite ends thereof are shown in cross section. Atoothed snatch roll 13 of well-known shape is arranged in parallel tothe lateral frames 10, 11 and 12, journaled on the side frame (notshown), and operatively connected with the motor (not shown) provided atthe proper position in the machine. By the power of the motor the snatchroll 13 is rotated constantly in the counterclockwise direction in FIG.1 when the machine is in operation. The type bar 14, to be operated bythe power of the roll 13, is provided with upper and lower types l5, 15at the striking end thereof, and is pivotally mounted at the lower endthereof to the type bar segment 16 by means of a pivot axis 17. The typebar 14 is normally in contact with the type bar rest 18, and moved intocontact with the platen I) from the rest position when typing.

A member 20 is at the rear end thereof, pivotally mounted to a bellcrank22 which is rotatable about an axis 21 on the lateral frame 10, and atthe fore end thereof, pivotally mounted to a link 25 which is rotatableabout an axis 24 on the lateral frame 12. Therefore, the member 20 formsa four joint link structure with the fixed pivots of said axes 21, 24and is reciprocated in a vertical plane. The member 20 is normally heldat its normal position shown in FIG. 1 by a return spring 26, which isanchored to the lower end of the member 20 and one end of a guide plate27 secured to the lateral frame 12. Bellcrank 22 is connected with thelower end of the type bar 1 3 through a wire 23. The type bar 14,bellcrank 22, and member 21) which are connected to one another performa type action normally disconnected from the snatch roll 13. The member21) has a pawl 29 pivotally mounted at point 28 and a trigger 3ipivotally mounted at point 30. The pawl 29 and trigger 31 are both madeof flat sheet metal and work as the intermediate means for connectingthe roll 13 with the type action. The pawl 29 is provided at the foreend thereof, with a tooth 29a to engage roll 13. The pawl 29 is urged inthe clockwise direction in FIG. I by spring 32 anchored between the pawl29 and the trigger 31, and is held at the normal position by the trigger31 so as not to engage the roll 13. The trigger 3! is urged in thecounterclockwise direction in FIG. 1 by the spring 32 and held at thenormal position by the stop lug 31a. (in the trigger 31 is formed a camsurface 31b at the portion to be brought into contact with the pawl 29.The pawl as is held at its normal position with respect to the member 20in the latching condition by the cooperation of the cam surface Bllb andthe spring 32, but when the trigger 31 is turned in the clockwisedirection from the normal position, latching ceases and the pawl 29slips toward the roll 13 from the cam surface 31b so as to engage theroll 13. When the pawl 29 is engaged with the roll 13, the member 20starts to be driven rearwardly by the power of the roll 13, whereby thetype bar 14 is operated.

A disengaging screw 33 is movably screwed into the lateral frame 11. Thescrew 33 engages the downwardly extended portion of the pawl 29 which isengaged with the roll 13, just before the finish of the transitory driveof the member 20, and rocks the pawl 29 to disengage it from the roll13.

The key lever 34 is provided, at the fore end thereof, with a key 37 andis pivotally mounted at the rear end thereof on the axis 36 supported bythe comb plate 35 which is secured to the lateral frame 10. The keylever guide frame 38 guides the forward portion of the key lever 34 soas to be moved vertically, at the comb portion, on the top thereof. Thekey lever 34 is urged upwardly by the return leaf spring 39 secured tothe comb plate 35, and is held at the nonnal rest position wherein theextension 34a extending downwardly from the central portion of the keylever 34 is engaged with the stop consisting of a cushion pad 40 adheredto the guide frame 38. The key lever 34 is depressible down to a firstand second depressed position from its normal position.

At the central portion of the key lever 34, a control lever 41, made offlat sheet metal, is pivotally mounted at the point 42. The controllever 41 is rotatable in a vertical plane parallel to the key lever 34.A weak spring 43 is anchored between the control lever 41 and the keylever extension 34b and urges the control lever 41 in the clockwisedirection in FIG. 1. The stop lug 41a of the control lever 41 normallyholds the control lever 41 in its normal position with respect to thekey lever 34, against the force of thespring 43. Therefore, the controllever 41 can be rotated only in the counterclockwise direction from itsnormal position. At the lower end of the control lever 41, a first andsecond portion 41b, 410 are provided so as to be normally positionedabove the trigger 31. The first and second portions 41b and 41c areextending vertically to a plane where the control lever 41 rotates andcross rectangularly to each other. As shown in FIG. 1, when the controllever 41 is in the normal position, the first portion 41b is directed inthe vertical direction and the second portion 410 is directed in thehorizontal direction. The directed extended portions 41b and 41c arelaterally bent from and integral with the control lever 41. The bottomend of the first portion 41b is adapted to engage the forward end 310 ofthe trigger 31 from above in response to the depression of the key lever34 and adapted to urge the forward end 31c downwardly.

Between the extension 34a of the key lever 34 and the key lever guideframe 38, a yieldable means is provided to define the first and secondposition of the key lever 34. The yieldable means comprises a two armedlever 44 provided on the extension 34a, spring 45, and stop pin 46, andcooperates with the stationary part 380 and adjustable part 38b formedon the lower end of the guide frame 38. The two-armed lever 44 is madeof flat sheet metal and has a first arm 44a extending forwardly in thehorizontal direction and a second arm 44b extending downwardly. Thetwo-armed lever 44 is pivotally mounted to the extension 340 of the keylever 34 at the pivot 47, so as to rotate in a vertical plane parallelto the key lever 34. The spring 45 is coiled around the pivot 47 and oneend thereof is anchored with the extension 34a of the key lever 34 andthe other end thereof is anchored with the first arm 44a of thetwo-armed lever 44 so as to urge the two-armed lever 44 in the clockwisedirection in FIG. 1. The stop pin 46 is provided at the extension 340 ofthe key lever 34 and holds the twoarmed lever 44 in the nonnal positionwith respect to the key lever 34, as shown in FIG. 1, against the forceof the spring 45. Therefore, the two-armed lever 44 is allowed to rotatein a counterclockwise direction from the normal position shown inFIG. 1. The stationary part 38a is formed integrally with and at thelower portion of the guide frame 38 and has a cushion pad 48 adheringthereto. The cushion pad 48 serves to stop the key lever 34 at the firstposition by engaging with the first arm 44a of the two-arm lever 44 whenthe key lever 34 is depressed.

The adjustable part 38b is formed in the shape of a comb 3812 at thelower portion of the guide frame 38. Each portion of the comb 38bcorresponds to each of the laterally arranged twoarmed levers 44. Thecomb portion 38b is bendable up and down at the connected point with thestationary part 38a. As described hereinafter, the adjustable part 38!;serves as the stop for determining the second depressed position of thekey lever 34 by the engagement thereof with the second arm 44!: of thetwo-armed lever 44 made by the depression of the key lever 34.

In operation: when power is supplied to the motor (not shown), thesnatch roll 13 rotates constantly in the counterclockwise direction inFIG. 1. When the key lever 34 is depressed, the bottom end of the firstportion 41b of the control lever 41 engages with the forward end 31c ofthe trigger 31. By engagement, only the trigger 31 is rocked around thepivot 30 relative to the member 20 from the normal position and at firststores the force of the spring 32. Further rocking of the trigger 31releases the pawl 29 held in the latching condi tion out of the camsurface 31b. The pawl 29 is rocked rapidly in the clockwise direction bythe operation of the spring 32 and engages the rotating roll 13 as shownin FIG. 2. By this engagement, the member 20 is actuated by the power ofthe power roll 13 and driven rearwardly substantially in the horizontaldirection with the pawl 29 against the force of return spring 26,thereby initiating the striking operation of the type bar 14 toward theplaten 19 through thebellcrank 22, and wire 23. At nearly the end of therearward driving stroke of the member 20, the portion of the pawl 29extending downwardly engages the disengaging screw 33, whereby the pawl29 is rotated in the counterclockwise direction about the pivot 28relative to member 20 and is disengaged form the roll 13. The pawl 29 isreturned up to the position on the cam surface 311; of the trigger 31 asshown in FIG. 3, before it is disengaged from the roll 13. At theinstance when the pawl 29 is disengaged from the roll 13, the pawl 29 israpidly rocked in the counterclockwise direction by the cooperation ofthe spring 32 with the camming action of the cam surface 31!; andcompletely restored to normal position with respect to member 20.Cooperating with the rocking of the pawl 29, the trigger 31 is alsorestored to normal position with respect to member 20 and holds the pawl29 in its latching condition again.

The member 20 finishes the positive drive thereof by the disengagementof the pawl 29 from the roll 13, but even after the supply of power iscut off the member 20 is driven rearwardly a little further by itsinertia. The member 20 having lost its inertia, returns to its normalposition by the return spring 26. At the same time, the type bar 14 isreturned to the rest position from typing position. On returning of themember 20, the trigger 31 is normally returned along a fixed path ofmovement until the member 20 reaches normal position.

If the key lever 34 is depressed and held at the first position onreturning of the trigger 31 or if the key lever 34 is held in thecondition where the first arm 44a of the two-armed lever 44 is engagedwith the cushion pad 48, the forward end 310 of the trigger 31 inreturning back impacts with the lower portion of the first portion 41b,since the first portion 41b of the control lever 41 is positioned at aposition slightly within the fixed path of movement of the trigger 31.On this impact of the lower portion 41b of the first portion, thetrigger 31 pushes the first portion 41b of the control lever 41 forwardas shown in FIG. 4 and rocks the control lever 41 in thecounterclockwise direction against the force of the spring 43. Thetrigger 31 moves the control lever 41 out of the fixed path completely,whereby the member 20 is able to return to its normal position. As theoperation of the spring 32 is stronger than the operation of the spring43, the trigger 31 is moved together with the member 20 on return, beingheld in its normal position with respect to the member 20 in which itholds the pawl 29 in latching condition. when the key lever 34 isdepressed to its first position, therefore, the driving movement of themember 20 is brought about in one cycle only, even if the key lever 34is maintained in its first depressed position. In the driving movementof the member 20, the type bar 14 performs one typing operation.

When the key lever 34 is further depressed from the first position to asecond depressed position, the two-armed lever 44 is rocked relative tothe extension 34a of the key lever 34 against the force of the spring 45until the second arm 44b is brought into engagement with the adjustablepart 38b as shown in FIG. with the first arm 441a engaged with thecushion pad 48. Thus the key lever 34 moves and is limited to the seconddepressed position. When the key lever 34 is depressed and held at thesecond position, the first portion lib of the control lever 41 is keptin the position deep in the fixed path of the trigger 31. Therefore, theforward end 310 of the trigger 31 on the returning member 20, impactsthe upper portion of the first portion 41b. On this movement of thetrigger 31, the trigger 31 pushes forward the first portion 41b of thecontrol lever 41 as he case hereinbefore mentioned and makes the controllever 41 rock in the counterclockwise direction against the force of thespring 43. But in this case, the more the trigger 31 rocks the controllever 41 so as to carry the first portion 41b out of the fixed path, thedeeper the second portion 41c'moves into the fixed path in response tothe rocking of the lever 41, and the trigger 31 is pushed downward bythe second portion llsv As a result the trigger 31 is operated torelease the pawl 29 from its latching condition by the second portion41:, and the pawl 29 again engages the roll 13. While the key lever 34is depressed to the second position, as described hereinabove; thedriving movement of the member is repeated, whereby a repeat typingoperation is carried out.

Since the second portion 410 moves down transversely to the fixed pathof the trigger 31, which is returning to the normal position, andcontacts with the upper edge of the trigger 31, the second portion 410can smoothly urge the trigger 31 downwardly without shock due todirectly impacting the trigger 31. There is no shock on the controllever 41 from the trigger 31, and rough shock is not transmitted to thefinger of the operator during repeat operation. Since the range ofrocking of the two-armed lever 44 can be varied by properly bending thecomb portion of the adjustable part 38b at the connecting point thereofwith the stationary part 38a, the second position for repeat operationcan be adjusted to the best position. The slight displacement of thesecond position influences the repeat operation, which requires that thesecond position be easily adjusted or controlled after construction ofthe machine. On the other hand, the first position for single operationwill not affect the operation of the trigger 33 on the first portion 41bof the control lever All by the displacement thereof as much as thesecond position. Therefore, adjustment of the first position is notrequired after construction of the machine. From this point of view, thedevice for controlling the position of the key lever 34 in accordancewith the present invention sufficiently satisfies the above requirements as the controlling device of the key lever 34, since the firstposition is always definite and only the second position isindependently adjustable or controllable for every key lever 34.

The controlling device is of course not limited to the abovedescribedembodiment and can be varied or modified in designing. For example, thecam surface 31b on the trigger 31 in the embodiment can be provided onpawl 29. Like this example, the present invention is not limited to theembodiment hereinabove described and various variations andmodifications can be effected within the spirit and scope of theinvention.

What is claimed is:

i. A repeat action mechanism for cyclically operating an instrumentalityin a power-operated typewriter comprising, in combination,

a frame,

a rotatable toothed snatch roll mounted on the frame,

a member operatively connected to the instrumentality and mounted on theframe for reciprocating movement from and to a normal position, saidmember being normally held in the normal position,

a pawl rockably mounted on the member for rocking movement relative tothe member to engage with and disengage from the roll,

a trigger rockably mounted on the member for rocking movement relativeto the member,

a spring anchored to the pawl and trigger for urging the pawl in adirection for engaging the pawl with the roll, said trigger having acontacting portion for contacting the pawl to normally hold the pawl inthe disengaged position from the roll against urging of the spring andtracing a fixed path during return of the member to the normal position,

a key lever mounted on the frame for depression from a normal positionto a first depressed and a second further depressed position,

a control lever pivotally mounted on the key lever and having a firstand a second portion formed on the free end thereof,

a bottom end of said first portion being arranged to contact the triggerand urging the trigger transversely to the fixed path, upon depressionof the key lever, to rock the trigger so as to release the pawl from thetrigger and engage the pawl with the roll thereby initiating theoperation of the instrumentality, and disengaging means mounted on theframe for rocking the pawl relative to the member to disengage the pawlfrom the roll following the movement of the member from the normalposition, means for locating said first portion in said fixed path whenthe key is held depressed in either of said depressed positions forengaging with an end of the trigger returning with the member, wherebythe trigger rocks the control lever to carry the first portion out ofthe fixed path and when the key lever is held depressed in the firstdepressed position with the trigger completely carrying the firstportion out of the fixed path to thereby terminate the operation of theinstrumentality in one cycle, and means arranging said second portionfor contacting the trigger, when the key lever is held depressed in thesecond position, for urging the trigger transversely to the fixed pathbefore the first portion is completely carried out of the fixed paththereby releasing the pawl from the trigger to engage the roll and tothereby cyclic repeat operation of the instrumentality.

2. A repeat action mechanism as defined in claim 1, further comprisingcamming means provided between the pawl and the contacting portion ofthe trigger and operatively associated with said spring for rocking thepawl to rapidly restore the pawl to the disengaged position after thepawl is disengaged from the roll by the disengaging means,

3. A repeat action mechanism as defined in claim 1, wherein said member,at one end, is connected to a bellcrank rockably mounted on a fixed axisand, at the other end, is connected to a link rockably mounted on afixed axis so that the member forms a four joint link structure with thefixed pivots of said two axes and moves along an almost straight line ina vertical plane.

4. A repeat action mechanism as defined in claim 1, wherein said firstand second portions are bent off from the control lever perpendicularlyto a plane of the rocking movement of the control lever and crossperpendicularly to each other and wherein said frame mounting saidstationary and adjustable parts carries, at an upper end, a comb whichguides said key lever to move in a vertical plane and said adjustablepart is a portion of said comb at the bottom end of said frame and isbendable relative to the stationary part.

5. A repeat action mechanism for cyclically operating an instrumentalityin a power-operated typewriter comprising, in combination,

a frame,

a rotatable toothed snatch roll mounted in the frame,

a member operatively connected to the instrumentality and mounted on theframe for reciprocating movement from and to a normal position, saidmember being urged to and normally held in the normal position,

a pawl rockably mounted on the member for rocking movement relative tothe member to engage with and disen' gage from the roll,

a trigger rockably mounted on the member for rocking movement relativeto the member,

a spring anchored to the pawl and to the trigger for urging the pawl ina direction engaging the pawl with the roll, said trigger having acontacting portion for contacting the pawl to normally hold the pawl inthe disengaged position from the roll against urging of the spring,

a key lever mounted on the frame for depression from a normal positionto a first depressed and a second further depressed position,

a control lever pivotally mounted on the key lever for rocking thetrigger to release the pawl from the trigger and engage the pawl withthe roll thereby initiating operation of the instrumentality,

disengaging means mounted on the frame for rocking the pawl relative tothe member to disengage the pawl from the roll following the movement ofthe member form the normal position, and

camrning means provided between the pawl and the contacting portion ofthe trigger and operatively associated with said spring for rocking thepawl to rapidly restore the pawl to the disengaged position after thepawl is disengaged from the roll by the disengaging means.

1. A repeat action mechanism for cyclically operating an instrumentalityin a power-operated typewriter comprising, in combination, a frame, arotatable toothed snatch roll mounted on the frame, a member operativelyconnected to the instrumentality and mounted on the frame forreciprocating movement from and to a normal position, said member beingnormally held in the normal position, a pawl rockably mounted on themember for rocking movement relative to the member to engage with anddisengage from the roll, a trigger rockably mounted on the member forrocking movement relative to the member, a spring anchored to the pawland trigger for urging the pawl in a direction for engaging the pawlwith the roll, said trigger having a contacting portion for contactingthe pawl to normally hold the pawl in the disengaged position from theroll against urging of the spring and tracing a fixed path during returnof the member to the normal position, a key lever mounted on the framefor depression from a normal position to a first depressed and a secondfurther depressed position, a control lever pivotally mounted on the keylever and having a first and a second portion formed on the free endthereof, a bottom end of said first portion being arranged to contactthe trigger and urging the trigger transversely to the fixed path, upondepression of the key lever, to rock the trigger so as to release thepawl from the trigger and engage the pawL with the roll therebyinitiating the operation of the instrumentality, and disengaging meansmounted on the frame for rocking the pawl relative to the member todisengage the pawl from the roll following the movement of the memberfrom the normal position, means for locating said first portion in saidfixed path when the key is held depressed in either of said depressedpositions for engaging with an end of the trigger returning with themember, whereby the trigger rocks the control lever to carry the firstportion out of the fixed path and when the key lever is held depressedin the first depressed position with the trigger completely carrying thefirst portion out of the fixed path to thereby terminate the operationof the instrumentality in one cycle, and means arranging said secondportion for contacting the trigger, when the key lever is held depressedin the second position, for urging the trigger transversely to the fixedpath before the first portion is completely carried out of the fixedpath thereby releasing the pawl from the trigger to engage the roll andto thereby cyclic repeat operation of the instrumentality.
 2. A repeataction mechanism as defined in claim 1, further comprising camming meansprovided between the pawl and the contacting portion of the trigger andoperatively associated with said spring for rocking the pawl to rapidlyrestore the pawl to the disengaged position after the pawl is disengagedfrom the roll by the disengaging means.
 3. A repeat action mechanism asdefined in claim 1, wherein said member, at one end, is connected to abellcrank rockably mounted on a fixed axis and, at the other end, isconnected to a link rockably mounted on a fixed axis so that the memberforms a four joint link structure with the fixed pivots of said two axesand moves along an almost straight line in a vertical plane.
 4. A repeataction mechanism as defined in claim 1, wherein said first and secondportions are bent off from the control lever perpendicularly to a planeof the rocking movement of the control lever and cross perpendicularlyto each other and wherein said frame mounting said stationary andadjustable parts carries, at an upper end, a comb which guides said keylever to move in a vertical plane and said adjustable part is a portionof said comb at the bottom end of said frame and is bendable relative tothe stationary part.
 5. A repeat action mechanism for cyclicallyoperating an instrumentality in a power-operated typewriter comprising,in combination, a frame, a rotatable toothed snatch roll mounted in theframe, a member operatively connected to the instrumentality and mountedon the frame for reciprocating movement from and to a normal position,said member being urged to and normally held in the normal position, apawl rockably mounted on the member for rocking movement relative to themember to engage with and disengage from the roll, a trigger rockablymounted on the member for rocking movement relative to the member, aspring anchored to the pawl and to the trigger for urging the pawl in adirection engaging the pawl with the roll, said trigger having acontacting portion for contacting the pawl to normally hold the pawl inthe disengaged position from the roll against urging of the spring, akey lever mounted on the frame for depression from a normal position toa first depressed and a second further depressed position, a controllever pivotally mounted on the key lever for rocking the trigger torelease the pawl from the trigger and engage the pawl with the rollthereby initiating operation of the instrumentality, disengaging meansmounted on the frame for rocking the pawl relative to the member todisengage the pawl from the roll following the movement of the memberform the normal position, and camming means provided between the pawland the contacting portion of the trigger and operatively associatedwith said spring for rocking the pawl to rapidly restore the pawl to thedIsengaged position after the pawl is disengaged from the roll by thedisengaging means.